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United States Department of Agriculture

Agricultural Research Service

Related Topics

Clive H Bock
Fruit and Nut Research
Research Plant Pathologist

Phone: (478) 956-6409
Fax: (478) 956-2929

21 DUNBAR ROAD
BYRON, GA, 31008

Projects
Mitigating Alternate Bearing of Pecan
Appropriated (D)
  Accession Number: 425973
Improvement and Implementation of Organic Pecan Systems in the Southeastern US.
Reimbursable (R)
  Accession Number: 422806

Publications (Clicking on the reprint icon Reprint Icon will take you to the publication reprint.)
Genome-wide characterization and selection of expressed sequence tag simple sequence repeat primers for optimized marker distribution and reliability in peach Reprint Icon - (Peer Reviewed Journal)
Chen, C., Bock, C.H., Okie, W., Gmitter, F.J., Jung, S., Main, D., Beckman, T.G., Wood, B.W. 2014. Genome-wide characterization and selection of expressed sequence tag simple sequence repeat primers for optimized marker distribution and reliability in peach. Tree Genetics and Genomes. http://link.springer.com/article/10.1007/s11295-014-0759-4.
Sequence analysis reveals genomic factors affecting EST-SSR primer performance and polymorphism Reprint Icon - (Peer Reviewed Journal)
Chen, C., Bock, C.H., Beckman, T.G. 2014. Sequence analysis reveals genomic factors affecting EST-SSR primer performance and polymorphism. Molecular Genetics and Genomics. http://link.springer.com/article/10.1007/s00438-014-0875-8.
Suppression of pecan and peach pathogens on different substrates using Xenorhabdus bovienii and Photorhabdus luminescens - (Peer Reviewed Journal)
Shapiro Ilan, D.I., Bock, C.H., Hotchkiss, M.W. 2014. Suppression of pecan and peach pathogens on different substrates using Xenorhabdus bovienii and Photorhabdus luminescens. Biological Control. 77, 1-6.
How many standard area diagram sets are needed for accurate disease severity assessment - (Abstract Only) - (09-May-14)
A comparison of raters and disease assessment methods for estimating disease severity for purposes of hypothesis testing - (Abstract Only) - (09-May-14)
Development and validation of standard area diagrams as assessment aids for estimating the severity of citrus canker on unripe oranges - (Abstract Only) - (09-May-14)
Disease severity assessment in epidemiological studies: accuracy and reliability of visual estimates of Septoria leaf blotch (SLB) in winter wheat - (Abstract Only) - (09-May-14)
Suppression of pecan scab and phytophthora using symbiotic bacteria and their byproducts - (Trade Journal)
Shapiro Ilan, D.I., Bock, C.H., Hotchkiss, M.W. 2014. Suppression of pecan scab and phytophthora using symbiotic bacteria and their byproducts. Pecan Grower. 25(4):66-74.
Research progress for integrated canker management - (Trade Journal)
Graham, J.H., Gruber, B., Bock, C.H. 2014. Research progress for integrated canker management. Citrus Industry. 95:20-24.
Hedging, fungicide distribution and scab control - (Other)
Bock, C.H., Stevenson, K., Brenneman, T.B., Hotchkiss, M.W., Smith, M.W., Goff, W., Wells, L., Wood, B.W. 2014. Hedging, fungicide distribution and scab control. Southeastern Pecan Growers Meeting Proceedings. http:sepga.com/files/6213/9468/6929/bock.pdf.
Genetic diversity and population structure of Fusicladium effusum on pecan in the U.S.A. - (Peer Reviewed Journal)
Bock, C.H., Wood, B.W., Stevenson, K.L., Arias De Ares, R.S. 2014. Genetic diversity and population structure of Fusicladium effusum on pecan in the U.S.A.. Plant Disease. 98:916-923.
What interval characteristics make a good disease assessment category scale Reprint Icon - (Peer Reviewed Journal)
Chian, K., Liu, S., Bock, C.H., Gottwald, T.R. 2014. What interval characteristics make a good disease assessment category scale. Phytopathology. 104(6): 575-585 http://dx.doi.org/10.1094?PHYTO-10-13-0279-R.
A comparison of UP-PCR and RAPD markers to study genetic diversity of Fusicladium effusum (G. Winter, cause of pecan scab - (Peer Reviewed Journal) - (14-Nov-13)
A comparison of the bioassay test and culture to detect Xanthomonas citri subsp. citri - (Peer Reviewed Journal) - (06-Sep-13)
Fusicladium effusum - (Other)
Bock, C.H. 2013. Fusicladium effusum. CABI Crop Protection Compendium. Wallingford, UK: www.cabi.org/cpc.
Efficacy of fungicides for control of scab on a mid-ripening peach variety in middle Georgia, 2011 Reprint Icon - (Other)
Brannen, P.M., Bock, C.H., Hotchkiss, M.W. 2013. Efficacy of fungicides for control of scab on a mid-ripening peach variety in middle Georgia, 2011. Plant Disease Management Reports. 7:STF023.
Efficacy of petal fall and shuck split fungicides for control of scab on peach in middle Georgia, 2012 - (Other)
Brannen, P.M., Bock, C.H., Hotchkiss, M.W. 2013. Efficacy of petal fall and shuck split fungicides for control of scab on peach in middle Georgia, 2012. Plant Disease Management Reports. 7:STF022 http://www.plantmanagementnetwork.org/pubtrial/pdmr/.
Efficacy of fungicides for control of scab on a mid-ripening peach variety in middle Georgia, 2012 - (Other)
Brannen, P.M., Bock, C.H., Hotchkiss, M.W. 2013. Efficacy of fungicides for control of scab on a mid-ripening peach variety in middle Georgia, 2012. Plant Disease Management Reports. 7:STF021 http://www.plantmanagementnetwork.org/pub/trial/pdmr/.
Peronosclerospora sorghi - (Other)
Bock, C.H. 2013. Peronosclerospora sorghi. CABI Crop Protection Compendium. Wallingford, UK: www.cabi.org/cpc.
Identification of the antifungal compound, trans-cinnamic acid, produced by Photorhabdus luminescens, a potential biopesticide against pecan scab - (Peer Reviewed Journal)
Bock, C.H., Shapiro Ilan, D.I., Wedge, D.E., Cantrell, C.L. 2013. Identification of the antifungal compound, trans-cinnamic acid, produced by Photorhabdus luminescens, a potential biopesticide against pecan scab. Journal of Pest Science. 87(1): 155-162.
Identification of the antifungal compound, trans-cinnamic acid, produced by Photorhabdus luminescens, a potential biopesticide against pecan scab - (Peer Reviewed Journal)
Bock, C.H., Shapiro Ilan, D.I., Wedge, D.E., Cantrell, C.L. 2014. Identification of the antifungal compound, trans-cinnamic acid, produced by Photorhabdus luminescens, a potential biopesticide against pecan scab. Journal of Pest Science. 87:155-162.
Unusual pecan diseases that might appear during a wet year - (Trade Journal)
Bock, C.H., Hotchkiss, M.W., Riley, C.C., Wood, B.W. 2013. Unusual pecan diseases that might appear during a wet year. Pecan Grower. 25:74-77.
A comparison of different category scales for estimating disease severity - (Proceedings)
Chiang, K., Liu, S., Bock, C.H., Gottwald, T.R. 2013. A comparison of different category scales for estimating disease severity. Plant Disease Epidemiology International Workshop Proceedings. August 22-25, 2013, Beijing, China:P36 (69pp).
Distribution of scab and management of the disease in large pecan trees - (Trade Journal)
Bock, C.H., Cottrell, T.E., Hotchkiss, M.W., Wood, B.W. 2013. Distribution of scab and management of the disease in large pecan trees. Pecan Grower. 25:22-34.
Magnetic and electric fields induce directional response in Steinernema carpocapsae - (Peer Reviewed Journal)
Ilan, T., Kim-Shapiro, D., Bock, C.H., Shapiro Ilan, D.I. 2013. Magnetic and electric fields induce directional response in Steinernema carpocapsae. International Journal for Parasitology. 43:781-784.
A comparison of culture and bioassay for detecting citrus canker - (Abstract Only)
Bock, C.H., Gottwald, T.R., Graham, J.H. 2013. A comparison of culture and bioassay for detecting citrus canker. Phytopathology. 103:S2.16 http:11apsjournals.apsnet.org/loi/phyto.
Fungicide spray coverage from ground-based sprayers in mature pecan trees - (Abstract Only)
Bock, C.H., Hotchkiss, M.W., Cottrell, T.E., Wood, B.W. 2013. Fungicide spray coverage from ground-based sprayers in mature pecan trees. Phytopathology. 103:S2.17 http://apsjournals.apsnet.org/loi/phyto.
Trunk applications of phosphite for the control of pecan scab - (Abstract Only)
Bock, C.H., Brenneman, T.B., Hotchkiss, M.W., Wood, B.W. 2013. Trunk applications of phosphite for the control of pecan scab. Phytopathology. 103:S2.17 http://apsjournals.apsnet.org/loi/phyto.
Trunk applications of phosphite for the control of foliar and fruit scab - (Peer Reviewed Journal)
Bock, C.H., Brenneman, T.B., Hotchkiss, M.W., Wood, B.W. 2013. Trunk applications of phosphite for the control of foliar and fruit scab. Crop Protection. 54:213-220.
Disease and spray coverage in pecan trees - (Other)
Bock, C.H., Hotchkiss, M.W., Wood, B.W. 2013. Disease and spray coverage in pecan trees. Georgia Pecan Growers Association. Available: https://www.georgiapecan.org/conference.da.
Organic methods for control of insect pests and diseases of pecan and peach - (Other)
Shapiro Ilan, D.I., Bock, C.H. 2013. Organic Methods for Control of Insect Pests and Diseases of Pecan and Peach. eOrganic. http://www.extension.org/pages/66504.
Integrated Management of Citrus Canker - (Trade Journal)
Graham, J.H., Gruber, B., Bock, C.H. 2013. Integrated Management of Citrus Canker. Citrus Industry. 92: 12-17.
Disease and spray coverage in pecan trees - (Other)
Bock, C.H. 2013. Disease and spray coverage in pecan trees. Southeastern Pecan Growers Meeting Proceedings. www.sepga.com/files/3413/6509/9081/Bock_SEPGA.pdf.
The effect of Horsfall-Barratt category size on the accuracy and reliability of estimates of pecan scab severity - (Peer Reviewed Journal)
Bock, C.H., Van Den Bosch, F., Parnell, S., Wood, B.W., Gottwald, T.R. 2013. The effect of Horsfall-Barratt category size on the accuracy and reliability of estimates of pecan scab severity. Plant Disease. 97:797-806.
Effect of the duration of inoculum exposure on development of citrus canker symptoms on seedlings of Swingle citrumelo - (Peer Reviewed Journal)
Bock, C.H., Graham, J.H., Gottwald, T.R., Cook, A.Z., Parker, P.P. 2014. Effect of the duration of inoculum exposure on development of citrus canker symptoms on seedlings of Swingle citrumelo. European Journal of Plant Pathology. 138:237-245.
Vertical distribution of scab in large pecan trees - (Peer Reviewed Journal)
Bock, C.H., Wood, B.W. 2013. Vertical distribution of scab in large pecan trees. Plant Disease. 97:626-634.
Pecan scab severity-effects of assessment methods - (Peer Reviewed Journal)
Bock, C.H., Wood, B.W., Gottwald, T.R. 2013. Pecan scab severity-effects of assessment methods. Plant Disease. 97:675-684.
Predisposition of citrus foliage to infection with Xanthomonas citri subsp. citri - (Peer Reviewed Journal)
Bock, C.H., Graham, J.H., Cook, A.Z., Parker, P., Gottwald, T.R. 2013. Predisposition of citrus foliage to infection with Xanthomonas citri subsp. citri. Journal of Plant Pathology. 95:99-106.
Controlling insect pests & diseases in organic pecan and peach production - (Other)
Shapiro Ilan, D.I., Bock, C.H. 2012. Controlling insect pests & diseases in organic pecan and peach production. Georgia Organics Incorporated. http://vimeo.com/43396297.
Induced resistance – does it have potential as a tool in pecan disease management? - (Trade Journal)
Bock, C.H., Wood, B.W., Hotchkiss, M.W. 2012. Induced resistance – does it have potential as a tool in pecan disease management?. Pecan Grower. 24:20-28.
Predisposition of citrus foliage to infection with Xanthomonas citri subsp. citri. - (Abstract Only)
Bock, C.H., Graham, J.H., Cook, A.Z., Parker, P., Gottwald, T.R. 2012. Predisposition of citrus foliage to infection with Xanthomonas citri subsp. citri. [abstract]. Phytopathology. 102:S4.13.
Development and validation of standard area diagrams to aide assessment of pecan scab symptoms on pecan fruit - (Peer Reviewed Journal)
Yadav, N.S., De Vos, S.M., Bock, C.H., Wood, B.W. 2013. Development and validation of standard area diagrams to aide assessment of pecan scab symptoms on pecan fruit. Plant Pathology. 62:325-335. 2013.
Evaluation of a phosphite fungicide to control pecan scab in the southeastern USA - (Peer Reviewed Journal)
Bock, C.H., Brenneman, T.B., Hotchkiss, M.W., Wood, B.W. 2012. Evaluation of a phosphite fungicide to control pecan scab in the southeastern USA. Crop Protection Journal. 34:58-65.
Options for pest and disease control in organic pecan - (Trade Journal)
Bock, C.H., Shapiro Ilan, D.I., Cottrell, T.E., Hotchkiss, M.W., Wood, B.W. Options for pest and disease control in organic pecan. The Pecan Grower. 23:32-46.2012.(Trade Journal).
Short distance dispersal of splashed bacteria of Xanthomonas citri subsp. citri from canker-infected grapefruit tree canopies in turbulent wind - (Peer Reviewed Journal)
Bock, C.H., Cook, A.Z., Parker, P.E., Gottwald, T.R., Graham, J.H. 2012. Short distance dispersal of splashed bacteria of Xanthomonas citri subsp. citri from canker-infected grapefruit tree canopies in turbulent wind. Plant Pathology. 61:829-836.
The effect of wind on dispersal of splash-borne Xanthomonas citri subsp citri at different heights and distances downwind of canker-infected grapefruit trees - (Peer Reviewed Journal)
Bock, C.H., Gottwald, T.R., Cook, A.Z., Parker, P.E., Graham, J.H. 2012. The effect of wind on dispersal of splash-borne Xanthomonas citri subsp citri at different heights and distances downwind of canker-infected grapefruit trees. Journal of Plant Pathology. 93:667-677.
Suppression of pecan scab by nickel - (Peer Reviewed Journal)
Wood, B.W., Reilly, C.C., Bock, C.H., Hotchkiss, M.W. 2012. Suppression of pecan scab by nickel. HortScience. 47(4):503-508.
Processess involved in the dispersal of Xanthomonas citri pv. citri from canker-infected citrus canopies, and in the infection of citrus foliage - (Proceedings)
Bock, C.H., Gottwald, T.R. 2011. Processess involved in the dispersal of Xanthomonas citri pv. citri from canker-infected citrus canopies, and in the infection of citrus foliage. In: Proceedings of the Workshop on Xanthomonas citri/Citrus canker, November 17-18, 2011, Ribeirao Preto, Brazil. p. 27-30.
A survey of survival and activity of citrus canker lesion populations on foliage, fruit and shoots in a Florida grapefruit orchard in 2009 and 2010 - (Proceedings)
Bock, C.H., Gottwald, T.R., Graham, J.H. 2011. A survey of survival and activity of citrus canker lesion populations on foliage, fruit and shoots in a Florida grapefruit orchard in 2009 and 2010. In: Proceedings of the Workshop on Xanthomonas citri/Citrus canker, November, 17-18, 2011, Ribeirao Preto, Brazil. p. 24-26.
Processes involved in the dispersal of Xanthomonas citri pv. citri from canker-infectd citrus canopies, and in the infection of citrus foliage - (Proceedings)
Bock, Clive H., Gottwald, Timothy R. 2011. Processes involved in the dispersal of Xanthomonas citri pv. citri from canker-infectd citrus canopies, and in the infection of citrus foliage. In: Proceedings of the Workshop on Xanthomonas citri/Citrus canker, November 17-18, 2011, Ribeirao Preto, Brazil. p. 27-30.
Processess involved in the dispersal of Xanthomonas citri pv. citri from canker-infected citrus canopies, and in the infection of citrus foliage - (Proceedings)
Bock, C.H., Gottwald, T.R. 2011. Processess involved in the dispersal of Xanthomonas citri pv. citri from canker-infected citrus canopies, and in the infection of citrus foliage. In: Proceedings of the Workshop on Xanthomonas citri/Citrus canker, November 17-18, 2011, Ribeirao Preto, Brazil. p. 27-30.
Detection and measurement of plant disease symptoms using visible-wavelength photography and image analysis - (Review Article)
Bock, C.H. and Nutter, F.W. Detection and measurement of plant disease symptoms using visible-wavelength photography and image analysis. CAB Reviews: Perspectives in Agriculture, Veterinary Science, Nutrition and Natural Resources 6: 1-15. doi: 10.1079/ PAVSNNR20116027. Available: http://www.cabi.org/cabreviews/. 2011. (Review).
An introduction to pecan anthracnose: What a grower needs to know - (Trade Journal)
Wood, B.W. 2011. An introduction to pecan anthracnose: What a grower needs to know. Pecan Grower. 23(1):28-33.
Influence of nickel on severity of pecan scab - (Abstract Only)
Wood, B.W., Reilly, C.C., Bock, C.H., Hotchkiss, M.W. 2011. Influence of nickel on severity of pecan scab. Phytopathology. 101:S193.
Characteristics of genetic variability among isolates of Fusicladium species from peach, almond and pecan in the USA - (Abstract Only) - (09-May-11)
Activity of citrus canker lesions on leaves, shoots and fruit of grapefruit in a Florida orchard from June 2010 to January 2011 - (Abstract Only)
Bock, C.H., Gottwald, T.R., Graham, T.H. 2011. Activity of citrus canker lesions on leaves, shoots and fruit of grapefruit in a Florida orchard from June 2010 to January 2011 [abstract]. Phytopathology. 101:S17.
Use of standard area diagrams to improve assessment of pecan scab on fruit - (Abstract Only)
Bock, C.H., Yadav, N.S., De Vos, S.M., Wood, B.W. 2011. Use of standard area diagrams to improve assessment of pecan scab on fruit. Phytopathology. 101:S196.
Evaluation of phosphite to control scab on pecan in the southeastern USA - (Abstract Only)
Bock, C.H., Brenneman, T.B., Hotchkiss, M.W., Wood, B.W. 2011. Evaluation of phosphite to control scab on pecan in the southeastern USA. Phytopathology. 101:S17.
The distribution of peach scab lesions on the surface of diseased peaches - (Peer Reviewed Journal)
Bock, C.H., Hotchkiss, M.W., Okie, W.R., Wood, B.W. 2011. The distribution of peach scab lesions on the surface of diseased peaches. European Journal of Plant Pathology. 130:393-402.
Distribution of canker lesions on the surface of diseased grapefruit - (Peer Reviewed Journal)
Bock, C.H., Parker, P.E., Gottwald, T.R. 2011. Distribution of canker lesions on the surface of diseased grapefruit. Plant Pathology. 60:986-991.
Infection and decontamination of citrus-canker-inoculated leaf surfaces - (Peer Reviewed Journal)
Bock, C.H., Parker, P. E., Cook, A. Z., Graham, J. H. and Gottwald, T. R. Infection and decontamination of citrus canker-inoculated leaf surfaces. Crop Protection 30: 259-264. 2011.
Exacerbation of citrus canker by citrus leafminer, Phyllocnistis citrella in Florida - (Peer Reviewed Journal)
Hall, D.G., Gottwald, T.R., Bock, C.H. 2010. Exacerbation of citrus canker by citrus leafminer, Phyllocnistis citrella in Florida. Florida Entomologist. 93:558-566.
A new class of fungicides for pecans - (Trade Journal)
Brenneman, T., Bock, C.H., Jason, B.J. 2010. A new class of fungicides for pecans. Pecan Grower. 22(2):8-9.
Distribution of canker lesions on grapefruit in Florida - (Abstract Only)
Bock, C.H., Parker, P.E., Gottwald, T.R. 2010. Distribution of canker lesions on grapefruit in Florida [abstract]. Phytopathology. 100:S15.
The activity of citrus canker lseions on grapefruit in Florida, June 2009-January 2010 - (Abstract Only)
Bock, C.H., Parker, P.E., Gottwald, T.R., Graham, J.H. 2010. The activity of citrus canker lesions on grapefruit in Florida, June 2009-January 2010 [abstract]. Phytopathology. 100:S15.
Wind speed and wind-associated leaf injury affect severity of citrus canker on Swingle citrumelo - (Peer Reviewed Journal)
Bock, C.H., Graham, J.H., Gottwald, T.R., Cook, A.Z., Parker, P.E. 2010. Wind speed and wind-associated leaf injury affect severity of citrus canker on Swingle citrumelo. European Journal of Plant Pathology. 128:21-38.
Wind speed effects on the quantity of Xanthomonas citri subsp. citri dispersed downwind from canopies of grapefruit trees infected with citrus canker - (Peer Reviewed Journal)
Bock, C.H., Graham, J.H., Gottwald, T.R., Cook, A.Z., Parker, P.E. 2010. Wind speed effects on the quantity of Xanthomonas citri subsp. citri dispersed downwind from canopies of grapefruit trees infected with citrus canker. Plant Disease. 94:725-736.
Methods to Sample Air Borne Propagules of Aspergillus Flavus - (Peer Reviewed Journal)
Bock, C.H., Cotty, P.J. 2006. Methods to sample air borne propagules of Aspergillus flavus. European Journal of Plant Pathology. 114:357-362.
Devices to Sample Airborne Propagules of Aspergillus Flavus in the Desert Regions of Southwest Arizona - (Proceedings)
Bock, C.H., Cotty, P. 2003. Devices to sample airborne propagules of aspergillus flavus in the desert regions of southwest arizona. Phytopathology. 93: S9.
Development of Eyespot on Winter Wheat in the Uk: Infection and Lesion Development on Stems in Relation to Thermal Time - (Proceedings)
Bock, C.H., Wan, A., Fitt, B.L., Jenkyn, J., Harvey, J., Goulds, A. 2003. Development of eyespot on winter wheat in the uk: infection and lesion development on stems in relation to thermal time. Phytopathology. 93:S10.
Development of Eyespot on Winter Wheat in the Uk: Penetration and Infection of Leaf Sheaths in Relation to Thermal Time - (Proceedings)
Bock, C.H., Wan, A., Fitt, B.L., Jenkyn, J., Harvey, J., Goulds, A. 2003. Development of eyespot on winter wheat in the uk: penetration and infection of leaf sheaths in relation to thermal time. Phytopathology. 93:S88.
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Last Modified: 7/28/2014
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